fix comma

fix comma

Author: huixie90

libcxx/include/__ranges/adjacent_view.h

@@ -181,7 +181,7 @@ class adjacent_view<_View, _Np>::__iterator {
   }
 
   template <class _Tp, size_t... _Is>
-  static auto __repeat_tuple_helper(index_sequence<_Is...>) -> tuple<decltype((_Is, std::declval<_Tp (*)()>()()))...>;
+  static auto __repeat_tuple_helper(index_sequence<_Is...>) -> tuple<decltype(std::declval<_Tp (*)(size_t)>()(_Is))...>;
 
 public:
   using iterator_category = input_iterator_tag;

libcxx/test/std/ranges/range.adaptors/range.adjacent/iterator/member_types.compile.pass.cpp

@@ -46,6 +46,10 @@ struct ConstVeryDifferentRange {
   forward_iterator<double*> end() const;
 };
 
+struct OverloadComma {
+  friend int operator,(auto&&, OverloadComma);
+};
+
 template <std::size_t N>
 void test() {
   int buffer[] = {1, 2, 3, 4};
@@ -147,4 +151,15 @@ void test() {
   test<2>();
   test<3>();
   test<5>();
+
+  {
+    // overload comma operator
+    OverloadComma buffer[] = {OverloadComma{}, OverloadComma{}, OverloadComma{}};
+    auto v                 = std::views::adjacent<2>(buffer);
+    using Iter             = decltype(v.begin());
+    static_assert(std::is_same_v<typename Iter::iterator_concept, std::random_access_iterator_tag>);
+    static_assert(std::is_same_v<typename Iter::iterator_category, std::input_iterator_tag>);
+    static_assert(std::is_same_v<typename Iter::difference_type, std::ptrdiff_t>);
+    static_assert(std::is_same_v<typename Iter::value_type, std::tuple<OverloadComma, OverloadComma>>);
+  }
 }